Conventions used

There are a number of text conventions used throughout this book.

Code in text: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: “Once you have checked that all services are up and running by navigating to localhost:8080, you can log in to your Airflow instance and see (and even operate) your DAG.”

A block of code is set as follows:

class MetricsPlugin(AirflowPlugin): 
    """Defining the plugin class""" 
    name = "Metrics Dashboard Plugin" 
    flask_blueprints = [metrics_blueprint] 
    appbuilder_views = [{
        "name": "Dashboard", "category": "Metrics", 
        "view": MetricsDashboardView()
    }]

Any command-line input or output is written as follows:

$ pip install airflowctl

Bold: Indicates a new term, an important word, or words that you see onscreen. For instance, words in menus or dialog boxes appear in bold. Here is an example: “To find the connections section of Apache Airflow, navigate to the top bar of the Airflow UI. By selecting Admin, the drop-down menu will show Connections.”

Tips or important notes

Appear like this.